A GAO assessment.
Puerto Rico will be in the annals of American disasters for a long time to come. See this most recent U.S. Government Accountability Office report: Puerto Rico Hurricanes: Status of FEMA Funding, Oversight, and Recovery Challenges.
Reading between the lines and then also from a few anecdotal stories told to me, not only was the Puerto Rico infrastructure a mess, but their ability to manage complex projects as a government was also deficient — and perhaps remains deficient. Thus you have additional control procedures and processes being put in place by FEMA.
Claire Rubin, Senior Researcher, shared the link above.